CN103920986A - Stir friction both-side welding method for medium-thickness plate - Google Patents
Stir friction both-side welding method for medium-thickness plate Download PDFInfo
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- CN103920986A CN103920986A CN201410186570.4A CN201410186570A CN103920986A CN 103920986 A CN103920986 A CN 103920986A CN 201410186570 A CN201410186570 A CN 201410186570A CN 103920986 A CN103920986 A CN 103920986A
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- welding
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- agitating friction
- stirring
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention relates to a stir friction both-side welding method for a medium-thickness plate and belongs to a novel metal material connection method. The welding method includes the following steps that firstly, magnesium alloy plates to be welded are in butt joint and are fixed to a worktable; secondly; secondly an FSW device is used for performing both-side welding graded welding on the magnesium alloy plates, and primary welding joint welding is performed on a stirring head at the rotating speed omega, the welding speed Vh and the pressing amount h; thirdly, a workpiece is overturned, secondary welding joint welding is performed on the back of a primary welding joint, and welding parameters are identical to those in the second step. According to the stir friction both-side welding method, due to the fact that the initial position of a secondary welding joint is adjusted, the plastic flow of metal can be improved, asymmetry of heating power influence areas on the two sides of cross sections of welding joints is easily avoided, and the mechanical property on connectors is improved. The defect that the root of the medium-thickness plate is not welded thoroughly is overcome, and the possibility that the metal of the surface-layer welding joints is locally overheated is also reduced through twice welding.
Description
Technical field
The invention belongs to the welding technique field in Materials Processing Engineering, be specifically related to a kind of agitating friction welding by both sides method for medium-thick plate.
Background technology
Magnesium alloy has high specific strength and specific stiffness, and dimensional stability is high, and damping property, heat conductivility, casting character and machinable are functional, is the lightest structural metallic materials of current industrial application and the functional material of specific use.Therefore, magnesium alloy obtains certain application at industrial circles such as automobile, Aero-Space, track traffics.The connection of magnesium alloy, mainly by melting, easily produces the defects such as evaporation, coarse grains and high residual stress traditionally.And novel friction stir welding is a kind of solid phase connecting method, without the defect of melting, residual stress and distortion are little, and applicable all-position welding.The method is welded on a face of the material to be welded of being everlasting, and is therefore called agitating friction single welding.
There is many deficiencies in single welding: one, the shaft shoulder only acts on surface of the work, easily causes Base Heat quantity not sufficient to form incomplete penetration defect; If two improve bottom defect by improving rotary speed, be prone to again top layer weld seam overheated.
Summary of the invention
For the lower problem of existing cut deal joint bonding strength, the object of the present invention is to provide a kind of agitating friction welding by both sides method.
This kind, for the agitating friction welding by both sides method of medium-thick plate, comprises the following steps:
Before step 1, weldering, with alcohol, the greasy dirt of sheet material to be welded is cleaned up, then sheet material is fixed on welding bench with fixture, make two sheet materials in docking and be positioned at same plane;
Step 2, stirring-head with rotary speed ω, dextrorotation veer from upper surface with insertion speed V
zinsert weld start position, keeping shaft shoulder volume under pressure is h;
Step 3, stirring-head are with welding speed V
halong interface left side, start welding, in welding process, keep rotary speed constant, until be soldered right side, thus form a welded seam;
Step 4, workpiece is overturn, at the back of a position while welding, carry out the welding of secondary weld seam, according to the difference of the original position of secondary weld seam, be divided into welding and incorgruous welding in the same way, welding parameter and step 2, three identical.
Beneficial effect of the present invention:
1, utilize stirring-head respectively two faces of welded piece to be welded, can improve the Plastic Flow of bottom metal, reduce the thermal gradient in thickness of slab direction, thereby improve the mechanical property of joint;
2, when being welded as for twice while welding in the same way, can avoid the advance side of twice welding to be positioned at sheet material homonymy, thereby change weak location.
Accompanying drawing explanation
Fig. 1 is that agitating friction welding by both sides welds schematic diagram in the same way.
Fig. 2 is the incorgruous welding schematic diagram of agitating friction welding by both sides.
The specific embodiment
In order to absolutely prove characteristic of the present invention and to implement mode of the present invention, provide embodiment below.
Following examples relate to that described welding point is carried out to mechanic property test method is as follows: Mechanics Performance Testing: welding point embodiment being made according to GB/2651-2008 is processed into 2 of tensile samples, and sample is carried out to quasi-static tensile experiment.The tensile strength of described magnesium-rare earth mother metal is 300MPa.
Embodiment 1
The thick rare earth-magnesium alloy board docking of 10mm is placed, be fixed on backing plate; The stirring-head shaft shoulder is concave-concave toroidal, and diameter is 20mm; Mixing needle is the thread-shaped of taper dextrorotation, diameter 5～7mm, and length is 4.8mm.By stirring-head and the solder side centering of rotation.While starting to weld, stirring-head inserts weld start position with insertion speed 20mm/min, and shaft shoulder volume under pressure is 0.2mm, stops 2s; Start to move, keeping the rotary speed of stirring-head is 600r/min, and speed of welding is 80mm/min; After stirring-head moves and stops, stopping 2s stirring-head and extract out, welding finishes, and obtains weld seam one time.By workpiece turning, at the back of a weld seam original position, as the original position of secondary welding, carry out the welding in the same way of secondary weld seam, welding parameter and step 2, three identical.Thereby welding finishes to obtain the complete weld seam of welding in the same way of agitating friction welding by both sides.
Welding point upper and lower surface is shaped good, there is no large distortion, without obvious defect; Known through quasi-static tensile Mechanics Performance Testing: joint tensile strength is 285.6MPa, reach 95.2% of strength of parent, fracture is positioned at nugget district.
Embodiment 2
The thick rare earth-magnesium alloy board docking of 10mm is placed, be fixed on backing plate; A weld seam preparation method step, with embodiment 1, obtains weld seam one time; By workpiece turning, at the back of a weld seam end position, as the original position of secondary welding, carry out the incorgruous welding of secondary weld seam, welding parameter is with embodiment 1.Thereby welding end obtains the complete weld seam of the incorgruous welding of agitating friction welding by both sides.
Welding point upper and lower surface is shaped good, there is no large distortion, without obvious defect; Known through quasi-static tensile Mechanics Performance Testing: joint tensile strength is 267.8MPa, reach 89.3% of strength of parent, fracture is positioned at the heating power influence district of twice welding.
Embodiment 3
The thick AZ80 magnesium alloy of 20mm is carried out to agitating friction welding by both sides and dock in the same way, the tensile strength of mother metal is 299MPa.Sheet material docking is fixed on backing plate, and the stirring-head shaft shoulder used is concave-concave toroidal, and diameter is 22mm; Mixing needle is the thread-shaped of taper dextrorotation, diameter 6～10mm, and length is 9.7mm.The technological parameter of twice welding is identical, is respectively: welding rotary speed is 250r/min, and speed of welding is 80mm/min, and volume under pressure is 0.2mm.Finally obtain the complete weld seam of welding in the same way of agitating friction welding by both sides.
Welding point upper and lower surface is shaped good, without obvious defect; Quasi-static tensile Mechanics Performance Testing obtains, and joint tensile strength is 262.2MPa, reaches 87.7% of strength of parent, and fracture site is in nugget district.
Embodiment 4
The thick AZ80 magnesium alloy of 20mm is carried out to the incorgruous docking of agitating friction welding by both sides, and the tensile strength of mother metal is 299MPa.The physical dimension of stirring-head used and technological parameter are with embodiment 3.
Welding point upper and lower surface is shaped good, without obvious defect; Quasi-static tensile Mechanics Performance Testing obtains, and joint tensile strength is 221.3MPa, reaches 74.0% of strength of parent, and fracture site is in the heating power influence district of twice welding.
Embodiment 5
The thick AZ80 magnesium alloy of 20mm is carried out to agitating friction single welded butt, and the tensile strength of mother metal is 336.5MPa.The stirring-head shaft shoulder used is that diameter is 32mm; Mixing needle is the thread-shaped of taper dextrorotation, diameter 9～14mm, and length is 19.7mm.The rotary speed of welding is 350r/min, and speed of welding is 80mm/min, and volume under pressure is 0.2mm.Finally obtain the complete weld seam of agitating friction single welding.
Welding point upper and lower surface is shaped good, without obvious defect; Quasi-static tensile Mechanics Performance Testing obtains, and joint tensile strength is 196.6MPa, reaches 58.4% of strength of parent, and fracture site is in nugget district.
The present invention includes but be not limited to above embodiment, every any being equal to of carrying out under the spirit and principles in the present invention, replaces or local improvement, all will be considered as within protection scope of the present invention.
Claims (9)
1. for an agitating friction welding by both sides method for medium-thick plate, it is characterized in that, comprise the following steps:
Before step 1, weldering, with alcohol, the greasy dirt of sheet material to be welded is cleaned up, then sheet material is fixed on welding bench with fixture, make two sheet materials in docking and be positioned at same plane;
Step 2, stirring-head with rotary speed ω, dextrorotation veer from upper surface with insertion speed V
zinsert weld start position, keeping shaft shoulder volume under pressure is h;
Step 3, stirring-head are with welding speed V
halong interface left side, start welding, in welding process, keep rotary speed constant, until be soldered right side, thus form a welded seam;
Step 4, workpiece is overturn, at the back of a position while welding, carry out the welding of secondary weld seam, according to the difference of the original position of secondary weld seam, be divided into welding and incorgruous welding in the same way, welding parameter and step 2, three identical.
2. a kind of agitating friction welding by both sides method for medium-thick plate as claimed in claim 1, is characterized in that the Mg-Gd-Y magnesium-rare earth that described sheet material is extrusion modling, thickness 10mm.
3. a kind of agitating friction welding by both sides method for medium-thick plate as claimed in claim 1 or 2, it is characterized in that, step 2 in step 4 in the same way in welding the advance side heating power influence district of twice welding be positioned at the both sides at joint welding center, and learn according to agitating friction single welding, the weakness zone that advance side heating power influence district is weld seam, and welding can effectively avoid the advance side weakness zone of twice welding to be positioned at the same side of joint in the same way.
4. a kind of agitating friction welding by both sides method for medium-thick plate as claimed in claim 1 or 2, is characterized in that, the physical dimension of stirring-head used is identical.
5. a kind of agitating friction welding by both sides method for medium-thick plate as claimed in claim 4, is characterized in that, described stirring-head is double intended circle shape, and mixing needle is right-handed thread type.
6. for an agitating friction welding by both sides method for medium-thick plate, it is characterized in that, comprise the following steps:
(1) before weldering, with alcohol, the greasy dirt of sheet material to be welded is cleaned up, then sheet material is fixed on welding bench with fixture, make two sheet materials in docking and be positioned at same plane;
(2) stirring-head with rotary speed ω, dextrorotation veer from upper surface with insertion speed V
zinsert weld start position, keeping shaft shoulder volume under pressure is h;
(3) utilize agitating friction soldering equipment to carry out two-sided gradation welding to it, stirring-head is with welding speed V
halong interface left side, start welding, in welding process, keep rotary speed constant, until be soldered right side, thus form a welded seam;
(4) workpiece is overturn, at the back of a weld seam end position, as the original position left side of secondary welding, carry out the welding of secondary weld seam, welding parameter and step (2), (3) are identical, are thisly welded as incorgruous welding.
7. a kind of agitating friction welding by both sides method for medium-thick plate according to claim 6, it is characterized in that, the advance side heating power influence district of twice welding in the incorgruous welding described in step (2), (3) and (4) is positioned at the homonymy at joint welding center, and learn according to agitating friction single welding, the weakness zone that advance side heating power influence district is weld seam, thus the advance side heating power influence district that makes the weak link of incorgruous welding appear at twice welding is positioned at the homonymy at weld seam center.
8. according to a kind of agitating friction welding by both sides method for medium-thick plate described in claim 6 or 7, it is characterized in that, step (2), (3) are identical with the physical dimension of stirring-head described in (4).
9. according to a kind of agitating friction welding by both sides method for medium-thick plate described in claim 6 or 7, it is characterized in that, described stirring-head is double intended circle shape, and mixing needle is right-handed thread type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410186570.4A CN103920986A (en) | 2014-05-05 | 2014-05-05 | Stir friction both-side welding method for medium-thickness plate |
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| CN201410186570.4A CN103920986A (en) | 2014-05-05 | 2014-05-05 | Stir friction both-side welding method for medium-thickness plate |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057683A (en) * | 2015-08-05 | 2015-11-18 | 南昌航空大学 | Method for improving uniformity of composite materials prepared through friction stir processing by adding rare earth oxide |
| CN108284272A (en) * | 2018-01-29 | 2018-07-17 | 辽宁忠旺铝合金精深加工有限公司 | A method of eliminating agitating friction weldering incomplete root penetration and Weak link |
| CN108526678A (en) * | 2017-03-06 | 2018-09-14 | 陕西飞机工业（集团）有限公司 | A kind of stirring friction-welding technique method of Z-type weld seam |
| CN108746983A (en) * | 2018-06-07 | 2018-11-06 | 航天工程装备（苏州）有限公司 | A kind of welding method improving T connector welding performance |
| CN112404695A (en) * | 2020-11-24 | 2021-02-26 | 昆山哈工万洲焊接研究院有限公司 | Method for eliminating defects in stirring friction welding of extraction plate |
| CN113146018A (en) * | 2021-03-17 | 2021-07-23 | 中国船舶重工集团公司第七二五研究所 | Solid-phase welding method for dispersed copper |
| CN113714622A (en) * | 2021-09-16 | 2021-11-30 | 山东大学 | Friction-stirring double-sided Z-shaped butt/lap composite welding method for medium-thickness plate heterogeneous material and application |
| CN114289856A (en) * | 2022-01-21 | 2022-04-08 | 沈阳航空航天大学 | Application of friction stir processing method in refining magnesium alloy structure |
| CN114289855A (en) * | 2022-01-21 | 2022-04-08 | 沈阳航空航天大学 | Welding method for improving asymmetry of friction stir welding seam structure |
| CN114309917A (en) * | 2022-01-11 | 2022-04-12 | 大连交通大学 | Butt-joint friction stir welding method for same/different materials |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105057683A (en) * | 2015-08-05 | 2015-11-18 | 南昌航空大学 | Method for improving uniformity of composite materials prepared through friction stir processing by adding rare earth oxide |
| CN108526678A (en) * | 2017-03-06 | 2018-09-14 | 陕西飞机工业（集团）有限公司 | A kind of stirring friction-welding technique method of Z-type weld seam |
| CN108284272A (en) * | 2018-01-29 | 2018-07-17 | 辽宁忠旺铝合金精深加工有限公司 | A method of eliminating agitating friction weldering incomplete root penetration and Weak link |
| CN108746983A (en) * | 2018-06-07 | 2018-11-06 | 航天工程装备（苏州）有限公司 | A kind of welding method improving T connector welding performance |
| CN112404695A (en) * | 2020-11-24 | 2021-02-26 | 昆山哈工万洲焊接研究院有限公司 | Method for eliminating defects in stirring friction welding of extraction plate |
| CN113146018A (en) * | 2021-03-17 | 2021-07-23 | 中国船舶重工集团公司第七二五研究所 | Solid-phase welding method for dispersed copper |
| CN113714622A (en) * | 2021-09-16 | 2021-11-30 | 山东大学 | Friction-stirring double-sided Z-shaped butt/lap composite welding method for medium-thickness plate heterogeneous material and application |
| CN114309917A (en) * | 2022-01-11 | 2022-04-12 | 大连交通大学 | Butt-joint friction stir welding method for same/different materials |
| CN114289856A (en) * | 2022-01-21 | 2022-04-08 | 沈阳航空航天大学 | Application of friction stir processing method in refining magnesium alloy structure |
| CN114289855A (en) * | 2022-01-21 | 2022-04-08 | 沈阳航空航天大学 | Welding method for improving asymmetry of friction stir welding seam structure |
| CN114289855B (en) * | 2022-01-21 | 2023-08-22 | 沈阳航空航天大学 | Welding method for improving friction stir welding seam tissue asymmetry |
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Application publication date: 20140716 |